I see a problem with this system.
With a conventional security camera or counter, passengers expect to be photographed or viewed, so they will coorporate by looking at the right place.
With this digital fish display, unless they put up a message at the beginning to "Look at the fish", frequent travellers are likely to bury their nose in their electronic device or be looking at anything else other than the pretty display that they have seen many times before.
In addition, are they after a left and right profile photos as well as the usual front on photo? That is the only reason I can see for them to have a dynamic image of fishes - to make you turn your head.